Search results for: photonic-band-gap-materials

Photonic Band Gap Materials

Author : C.M. Soukoulis
File Size : 26.50 MB
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Photonic band gap crystals offer unique ways to tailor light and the propagation of electromagnetic waves. In analogy to electrons in a crystal, EM waves propagating in a structure with a periodically-modulated dielectric constant are organized into photonic bands separated by gaps in which propagating states are forbidden. Proposed applications of such photonic band gap crystals, operating at frequencies from microwave to optical, include zero- threshold lasers, low-loss resonators and cavities, and efficient microwave antennas. Spontaneous emission is suppressed for photons in the photonic band gap, offering novel approaches to manipulating the EM field and creating high-efficiency light-emitting structures. Photonic Band Gap Materials identifies three most promising areas of research. The first is materials fabrication, involving the creation of high quality, low loss, periodic dielectric structures. The smallest photonic crystals yet fabricated have been made by machining Si wafers along (110), and some have lattice constants as small as 500 microns. The second area is in applications. Possible applications presented are microwave mirrors, directional antennas, resonators (especially in the 2 GHz region), filters, waveguides, Y splitters, and resonant microcavities. The third area covers fundamentally new physical phenomena in condensed matter physics and quantum optics. An excellent review of recent development, covering theoretical, experimental and applied aspects. Interesting and stimulating reading for active researchers, as well as a useful reference for non-specialists.

Photonic Band Gap Materials

Author : C.M. Soukoulis
File Size : 22.98 MB
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Photonic Bandgap Materials and Devices

Author : Ali Adibi
File Size : 69.19 MB
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Photonic Band Gaps and Localization

Author : C.M. Soukoulis
File Size : 33.61 MB
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This volume contains the papers presented at the NATO Advanced Research Workshop on Localization and Propagation o[ Classical Waves in Random and Periodic Media held in Aghia Pelaghia, Heraklion, Crete, May 26- 30, 1992. The workshop's goal was to bring together theorists and experimentalists from two related areas, localization and photonic band gaps, to highlight their common interests. The objectives of the workshop were (i) to assess the state of-the-art in experimental and theoretical studies of structures exhibiting classical wave band gaps and/or localization, (ii) to discuss how such structures can be fabricated to improve technologies in different areas of physics and engineering, and (iii) to identify problems and set goals for further research. Studies of the propagation of electromagnetic (EM) waves in periodic and/or disordered dielectric structures (photonic band gap structures) have been and continue to be a dynamic area of research. Anderson localization of EM waves in disordered dielectric structures is of fundamental interest where the strong ei-ei interaction efFects entering the eIectron-localization are absent.

Photonic Bandgap Structures Novel Technological Platforms for Physical Chemical and Biological Sensing

Author : Marco Pisco
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This E-Book covers the research and the development of a novel generation of photonic devices for sensing applications. The E-Book starts with a brief review of basic photonic crystal (PhC) structure related concepts and describes the numerical and technological tools useful in the design and fabrication of devices based on PhCs. Next, the E-Book provides a selection of crossover topics emerging in the scientific community as breaking through researches, technologies and sciences for the development of novel technological platforms for physical, chemical and biological sensing. The E-Book ends with a description of the main PhC sensors to date by representing many of the exciting sensing applications that utilize photonic crystal structures.

On chip Silicon Based Photonic Structures

Author : Yasha Yi
File Size : 85.99 MB
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(Cont.) The whole process is compatible with current microelectronics process technology. There are several potential applications of this technology in wavelength division multiplexing (WDM) devices. Thirdly, to further extend the photonic crystal idea, we studied the quasi-photonic crystal structures and their properties, especially for the fractal photonic band gap properties and the transparent resonant transmission states. A-periodic Si/SiO2 Thue-Morse (T-M) multilayer structures have been fabricated, for the first time, to investigate both the scaling properties and the omnidirectional reflectance at the fundamental optical band-gap. Variable angle reflectance data have experimentally demonstrated a large reflectance band-gap in the optical spectrum of a T-M quasicrystal, in agreement with transfer matrix simulations. The physical origin of the T-M omnidirectional band-gap has been explained as a result of periodic spatial correlations in the complex T-M structure. The unprecedented degree of structural flexibility of T-M systems can provide an attractive alternative to photonic crystals for the fabrication of photonic devices.

Encyclopedia of Optical Engineering Pho Z pages 2049 3050

Author : Ronald G. Driggers
File Size : 58.72 MB
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Compiled by 330 of the most widely respected names in the electro-optical sciences, the Encyclopedia is destined to serve as the premiere guide in the field with nearly 2000 figures, 560 photographs, 260 tables, and 3800 equations. From astronomy to x-ray optics, this reference contains more than 230 vivid entries examining the most intriguing technological advances and perspectives from distinguished professionals around the globe. The contributors have selected topics of utmost importance in areas including digital image enhancement, biological modeling, biomedical spectroscopy, and ocean optics, providing thorough coverage of recent applications in this continually expanding field.

Functional Materials

Author : S. Banerjee
File Size : 73.43 MB
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Functional materials have assumed a very prominent position in several high-tech areas. Such materials are not being classified on the basis of their origin, nature of bonding or processing techniques but are classified on the basis of the functions they can perform. This is a significant departure from the earlier schemes in which materials were described as metals, alloys, ceramics, polymers, glass materials etc. Several new processing techniques have also evolved in the recent past. Because of the diversity of materials and their functions it has become extremely difficult to obtain information from single source. Functional Materials: Preparation, Processing and Applications provides a comprehensive review of the latest developments. Serves as a ready reference for Chemistry, Physics and Materials Science researchers by covering a wide range of functional materials in one book Aids in the design of new materials by emphasizing structure or microstructure – property correlation Covers the processing of functional materials in detail, which helps in conceptualizing the applications of them

Topics in Computational Materials Science

Author : C Y Fong
File Size : 38.66 MB
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This book describes the state-of-the-art research topics in theoretical materials science. It encompasses the computational methods and techniques which can advance more realistic calculations for understanding the physical principles in new growth methods of optoelectronic materials and related surface problems. These principles also govern the photonic, electronic, and structural properties of materials which are essential for device applications. They will also provide the crucial ingredients for the growth of future novel materials. Contents:Advances in Algorithmic Development in the Electronic Structure of Large Systems (E B Stechel)Plane Wave Pseudopotential Electronic Structure Calculations on Parallel Supercomputers (J S Nelson & S J Plimpton)First-Principles Theory of Electron Excitation Energies in Solids, Surfaces, and Defects (S G Louie)Photonic Band Structure (R Biswas et al.)Tight-Binding Parametrization of First-Principles Results (M J Mehl & D A Papaconstantopoulos)First Principles Studies of Stability of Intermetallic Binary Alloys (Z W Lu & B M Klein)Simulation of Semiconductor Growth Mechanisms in the Presence of Adsorbate Layers (E Kaxiras)Bond Saturation Model: A Lattice Gas Approach for Studying Close Packed Metallic Surfaces (M C Fallis & C Y Fong) Readership: Materials scientists. keywords:Linear Scaling;Density Matrix Algorithm;Quasi-Particle Excitations;Self-Energy;GW Approximation;Density Functional Theory – Based Slater Koster Tight-Binding Parametrization;Intermetallic Binary Alloys;Short-Range Order;Alloy Stability;Semiconductor Growth;Activation Energy;Kinetic Monte Carlo Simulations;Lattice Gas Approach;Metallic Surfaces;Bond Saturation Model;Cluster Energetics;Embedded Atom Method

Material Substructures in Complex Bodies

Author : Gianfranco Capriz
File Size : 84.23 MB
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Stringent industrial requirements of sophisticated performances and of circumstantial control for micro-devices or nanotechnology manufactures, and other types of machinery at multiple scales, can be satisfied often only by resort to or allowance for complex materials. The adjective 'complex' beckons to the fact that the substructure influences gross mechanical behaviour in a prominent way and interactions due to substructural changes are represented directly. The description of the mechanical behaviour of complex bodies proposes a wide class of challenging problems from macroscopic-to-nano-world. The collection of chapters composing this book aims to explore some aspects of these problems, proposing also new matter of discussion together with specific solutions. Contributors are Carlo Cercignani, Gianfranco Capriz, Pierre Degond, Antonio Fasano, Harley T. Johnson, Sukky Jun, Krishna Kannan, Wing Kam Liu, Alberto Mancini, Paolo Maria Mariano, Ingo Müller, Kumbakonan R. Rajagopal, Jan Jerzy Slawianowski. The book can be a useful tool for Scholars and PhD students addressing their research activity toward basic mathematical and physical problems accruing from the mechanics of materials.